CN1615060A - Light-emitting device, method of manufacturing light-emitting device, and electronic device - Google Patents

Abstract

The invention provides a light-emitting device, a method for manufacturing the same, and an electronic apparatus, wherein the light-emitting device (100) is provided with a light-emitting element (13) formed by sequentially laminating a 1 st electrode (14), a functional layer (25) containing a light-emitting layer (15), and a 2 nd electrode (17) on a substrate (12), the 1 st electrode (14) and the 2 nd electrode (17) have light reflectivity, and the 2 nd electrode (17) has an opening (17a) for transmitting light from the light-emitting layer (15). The light-emitting device can improve the extraction efficiency of emitted light, has high reliability that can obtain uniform display luminance on the display surface, and can suppress the reduction of the extraction efficiency of emitted light due to various wiring structures even when a large screen is implemented.

Description

Light-emitting device, method of manufacturing light-emitting device, and electronic device

technical field

The present invention relates to a light emitting device represented by, for example, a liquid crystal device, an organic EL (Electro-Luminescence) device, and an inorganic EL device, a method for manufacturing the light emitting device, and an electronic device incorporating the light emitting device.

Background technique

Conventionally, among light-emitting devices such as organic electroluminescence (hereinafter simply referred to as organic EL) devices, there are devices having a structure in which a plurality of circuit elements, an anode, a hole injection layer, and an EL material etc. are stacked on a substrate. The light-emitting layer, the cathode, and the like formed of the electro-optical substance are sealed by being interposed between the substrate and the substrate by the sealing substrate. Specifically, on a transparent substrate such as a glass substrate, an anode made of a transparent conductive material such as indium tin oxide (ITO: Indium Tin Oxide) and tin oxide (SnO ₂ ), and an anode made of a polythiophene derivative (hereinafter A hole injection layer formed by a dopant (PEDOT for short), a light-emitting layer formed by a light-emitting substance such as polyfluorene, and a cathode formed by a metal material or a metal compound with a low work function such as Ca.

Such an organic EL device utilizes a phenomenon in which holes injected from the anode side and electrons injected from the cathode side are recombined in a light-emitting layer having fluorescent energy and deactivated from an excited state to emit light.

In addition, as a structure for extracting emitted light toward the observer, for example, a structure called bottom emission is known, which extracts emitted light from the side of a substrate on which circuit elements are formed (for example, refer to Patent Document 1.) . In addition, in recent years, the demand for larger size, higher definition, and higher brightness of organic EL devices has been increasing, which is conducive to the development of top-emission organic EL devices that achieve higher aperture ratios and higher efficiency of light-emitting elements. It is actively underway (for example, refer to Patent Document 2.).

[Patent Document 1] Specification of US Patent No. 4356429

[Patent Document 2] Text of International Publication No. WO98/36407

In a top-emission organic EL device, it is necessary to make the upper electrode on the light extraction side transparent, and in the structure described in Patent Document 1, an ITO (Indium Tin Oxide: indium tin oxide) film or Laminated film of thin Al film and ITO film. However, when this structure is adopted, since the transparent conductive film represented by ITO has a higher resistance than the metal film represented by Al, the voltage drop caused by the resistance of the transparent conductive film itself will cause the failure of the light-emitting element. Uneven brightness.

In addition, when an upper electrode made of at least a metal film typified by Al is formed, sufficient transparency cannot be obtained, and there is a problem that light extraction efficiency is lowered.

In addition, most of the techniques for making electrodes transparent in the top-emission structure have problems such as not being able to obtain sufficient transparency, or having problems such as poor reliability even if transparency is obtained. In addition, in the conventional organic EL device, since the light generated in the light-emitting layer is directly taken out to the outside, there is a problem that about 20% of the light cannot be taken out.

In addition, when a transparent conductive material made of a metal oxide such as ITO is laminated on an electron injection layer containing an alkali metal such as Li, Na, or an alkaline earth metal such as Be, Mg, or Ca with a low work function, the electron injection layer may be easily damaged. The problem.

On the other hand, in a bottom emission type organic EL device, since various wirings are arranged at positions that block emitted light, there is a problem that such wirings lower the extraction efficiency of emitted light.

Contents of the invention

The present invention has been made in view of the above problems, and its object is to provide a high-reliability display that can achieve an improvement in the extraction efficiency of emitted light and that can obtain uniform display brightness within the display surface, even when implementing a large-screen display. A light-emitting device, a method of manufacturing a light-emitting device, and an electronic device that can suppress a reduction in the extraction efficiency of emitted light due to various wiring structures even in the case of a light-emitting device.

In order to solve the above-mentioned problems, the present invention provides a light-emitting device including a light-emitting element formed by sequentially stacking a first electrode, a functional layer including a light-emitting layer, and a second electrode on a substrate, wherein the first electrode and the second electrode The electrode has light reflectivity, and the second electrode has an opening through which light from the light emitting layer passes.

In the present invention, the so-called light-emitting device is a general term including devices that convert electrical energy into light energy to generate light emission.

In addition, the term "opening" in the present invention refers to a portion through which light from the light-emitting layer passes, and means a portion where no electrode is formed or a hole portion formed on the electrode. In addition, when a transparent electrode and a non-transparent electrode are stacked, in the hole portion formed on the non-transparent electrode, since light passes through the transparent electrode, the hole portion It also has the meaning of being an opening.

According to the present invention, the light generated in the light-emitting layer by supplying electric energy to the functional layer sandwiched by the first electrode and the second electrode is reflected between the first electrode and the second electrode, and is directed toward the functional layer. Propagate in the plane direction of the second electrode, so that it can be taken out to the outside of the functional layer by using the opening of the second electrode.

In addition, in the present invention, when a transparent conductive material made of a metal oxide is not used as the second electrode, since an alkali metal such as Li or Na or an alkaline earth metal such as Be, Mg, or Ca can be used, it has a low work function. The material is used as the electron injection layer, so electrons can be efficiently injected into the light-emitting layer, so that the brightness of light from the light-emitting element can be improved.

In addition, in the light-emitting device, since the light generated in the light-emitting layer is emitted without passing through the transparent conductive film, the generated light is efficiently taken out without substantially attenuating, thereby realizing a bright display.

In addition, in the present invention, since the second electrode can use a metal film with light reflectivity, excellent reliability, and low resistance, it is possible to reduce the brightness unevenness of the light-emitting element caused by the voltage drop caused by the resistance of the second electrode itself. . In addition, higher reliability can be obtained compared to conventional light-emitting devices in which electrodes are formed of transparent conductive materials.

In the light-emitting device of the present invention, it is preferable that the first electrode has an inclined surface portion inclined with respect to the substrate surface in a region where the second electrode is not formed.

In this way, in the region where the second electrode is not formed, which is the region where the light propagating inside the functional layer is extracted to the outside, more light can be extracted to the front side of the light-emitting device (approximately normal direction of the substrate). .

That is, it is possible to provide a light-emitting device capable of obtaining a high-brightness display in the direction of the observer. In addition, it is preferable that the inclination angle of the inclined surface is set to be about 45° with respect to the base surface. In this way, the light propagating inside the functional layer and reflected from the inclined surface can be emitted toward the normal direction of the substrate, so that the brightest display can be obtained on the front of the light emitting device.

In the light-emitting device of the present invention, it is preferable that a partition wall surrounding the light-emitting element is provided, and the first electrode is extended to an inner wall surface of the partition wall.

In this way, the first electrode extending from the inner wall surface of the partition wall is arranged so as to stand up from the electrode surface at the inner wall surface. In this way, since the light propagating inside the functional layer is reflected by the raised portion of the first electrode, it is extracted toward the front side of the device with high directivity, thereby obtaining a high-brightness display in the direction of the observer.

In the light-emitting device of the present invention, a configuration may be adopted which further includes an internal partition wall dividing a region surrounded by the partition wall two-dimensionally, and the first electrode is extended on an inner wall surface of the internal partition wall.

In the light-emitting device of the present invention, since the light generated in the region where the first electrode and the second electrode are arranged facing each other propagates toward the surface direction of the functional layer, and is extracted to the outside in the region where the second electrode is not formed, When the propagation distance inside the functional layer becomes longer, although the amount of attenuation increases, there is a possibility that the efficiency may decrease. Therefore, by dividing the light-emitting element by the internal partition wall as in the present invention, the opposing area (light-emitting area) of the two electrodes can be reduced, thereby reducing the amount of attenuation inside the functional layer. In addition, since the first electrode is formed up to the inner wall surface of the internal partition wall, light can be efficiently extracted in a specific direction by using the first electrode formed on the inner wall surface. The present invention is especially suitable for a large-screen light-emitting device with a large planar area of the light-emitting element.

In the light-emitting device of the present invention, preferably, the inner wall surface of the partition wall or the inner partition wall has an inclination angle of about 45° with respect to the surface of the base body.

In this way, the inclination angle of the first electrode formed on the inner wall surface can be set to about 45°, so that the light propagating inside the functional layer can be efficiently emitted toward the front of the light emitting device.

In the light-emitting device of the present invention, it is preferable that an anti-reflection mechanism is provided on the outer surface of the second electrode.

In this way, external light can be prevented from being reflected by the second electrode disposed on the display surface of the light emitting device, thereby providing a light emitting device with excellent visibility.

In the light-emitting device of the present invention, the second cathode is preferably composed of a transparent conductive film having light transmittance, and an auxiliary electrode that assists the conductivity of the transparent conductive film. The opening through which light from the light emitting layer passes.

Here, the transparent conductive film is preferably formed on the entire surface of the functional layer. In addition, it is preferable that an auxiliary electrode is formed on the surface of the transparent conductive film. In addition, it is preferable that the auxiliary electrode has light reflectivity.

In such a light-emitting device, when electric energy is supplied to the functional layer sandwiched between the first electrode and the second cathode, the electric energy is supplied between the transparent conductive film and the first electrode, and at the same time, the auxiliary electrode assists The conductivity of the transparent conductive film supplies electric energy to the functional layer. In addition, in the light-emitting layer to which electric energy is supplied in this way, emitted light can be generated, and the emitted light can be reflected multiple times between the first electrode and the auxiliary electrode, and the emitted light can be transmitted between the functional layer and the transparent conductive film. By propagating in the surface direction, it can be taken out to the outside of the functional layer at the opening of the auxiliary electrode. That is, in the light-emitting device, since the auxiliary electrode improves the conductivity of the transparent conductive film, electric energy can be efficiently supplied to the functional layer, and the emitted light can be extracted efficiently to realize a bright display. In addition, since the transparent conductive film is formed on the entire surface of the functional layer, the contact area with the functional layer can be increased compared to the case where electrodes are formed in contact with a part of the functional layer. In this way, compared with the case where electrodes are formed on a part of the functional layer, the light emitting area can be increased.

Therefore, as described above, since the conductivity of the transparent conductive film is assisted by the auxiliary electrode, the conductivity can be improved, and the light emitting area can be increased, so that further improvement in luminous efficiency can be achieved.

In addition, the light-emitting device of the present invention is a light-emitting device in which a pair of opposing electrodes and a functional layer including a light-emitting layer sandwiched between these electrodes are provided on a substrate. Wiring that shields the display area of the substrate is provided between them, a light-reflective reflective surface is formed on the side of the light-emitting layer on the wiring, and the light-emitting layer is formed on the side of the wiring. The openings that emit light through.

Here, the wiring refers to various wirings such as wiring of switching elements such as TFTs, power supply lines for supplying current to the light-emitting layer, and capacitor lines for maintaining a specific potential.

In such a light-emitting device, when the light-emitting layer emits light, the emitted light may be directly emitted from the opening to the outside of the substrate, or the emitted light may collide with wiring. Here, since the reflective surface is formed on the wiring, the emitted light is reflected by the reflective surface of the wiring or the electrode and exits from the opening, or propagates through the horizontal direction of the light-emitting layer after multiple reflections and then exits from the opening.

Therefore, even when the wiring is formed so as to block the display area, the emitted light is reflected and emitted from the opening, so that the extraction efficiency of the emitted light can be improved. In addition, in the case of enlarging the screen of the light-emitting device, in order to reduce the resistance of the wiring resistance, the line width becomes thicker, and the display area is blocked, which may cause a decrease in the extraction efficiency of emitted light. However, by According to such a configuration, it is possible to suppress a decrease in extraction efficiency of emitted light. Therefore, since the degree of freedom of the wiring structure and wiring pattern increases, the TFT wiring or the power supply line can be located at a desired position, and a larger screen can be easily implemented.

In addition, since the emitted light is emitted from the opening formed on the side of the wiring, for example, by patterning the wiring into a desired pattern, the emitted light can be emitted from a desired opening. In addition, when the intensity of the emitted light is uneven due to the shape of the light emitting layer or the electrode, in order to efficiently extract the emitted light, it is possible to actively adjust the pattern of the wiring and form the opening at a desired position. The extraction efficiency of emitted light is further improved.

Furthermore, the above configuration is particularly effective in a so-called bottom emission structure in which emitted light is taken out from the side of the substrate on which TFTs and various wirings are provided.

In addition, in the light-emitting device, a plurality of branched wirings are formed on the light-emitting layer.

By branching the wiring into a plurality in this way, a plurality of branch lines are formed, and a plurality of openings are formed between these branch lines. Therefore, emitted light can be emitted from the opening adjacent to the branch line. Here, by forming these branch wires into a desired pattern, emitted light can be emitted from a desired opening. In addition, when the intensity of the emitted light is uneven due to the shape of the light emitting layer or the electrode, in order to efficiently extract the emitted light, by actively branching the wiring and forming an opening at a desired position, further improvement can be achieved. Improve the extraction efficiency of emitted light. In addition, since multiple reflections can be avoided, attenuation of emitted light caused by these multiple reflections can be suppressed.

In addition, in the above-mentioned light-emitting device, the reflective surface has a light-scattering property for scattering emitted light.

In this way, since the reflective surface has light-scattering properties, it is possible to scatter emitted light that collides with the reflective surface. Therefore, deviation of the reflection direction of emitted light can be prevented.

In addition, the light-scattering property referred to here is preferably such that emitted light is not reflected on the light-emitting layer side. Thus, since multiple reflections can be avoided, attenuation of emitted light caused by these multiple reflections can be suppressed.

In addition, in the above-described light-emitting device, one of the electrodes sandwiching the light-emitting layer has light reflectivity.

Here, "the side of the electrodes sandwiching the light emitting layer" is preferably an electrode located on the opposite side to the wiring as viewed from the light emitting layer.

In this way, since the electrodes have light reflectivity, emitted light emitted from the light-emitting layer toward the electrodes or emitted light reflected by the wiring can be reflected toward the wiring or the opening.

In addition, in the above-mentioned light-emitting device, the light-emitting layer has a concave-convex surface on a side opposite to the wiring.

In this way, since the light-emitting layer has a concave-convex surface, light can be emitted according to the shape of the concave-convex surface. In addition, by providing the light-reflective electrode so as to cover the concave-convex surface, emitted light can be emitted in the direction normal to the concave-convex surface.

In addition, by forming the concave-convex surface in a desired shape, the emitted light can be focused to a desired position, thereby partially increasing the luminous intensity. In addition, by causing such emitted light to be directly emitted from the opening or reflected and emitted, it is possible to further enhance the extraction efficiency of the emitted light.

In addition, in the light-emitting device, at the end of the uneven surface, the angle formed by the vertical direction of the substrate and the uneven surface is not less than 30° and not more than 50°.

In this way, the effect of having the above-mentioned concave-convex surface can be well obtained.

In addition, in the light-emitting device, the top or bottom of the concave-convex surface corresponds to the opening.

In this way, the effect of having the above-mentioned concave-convex surface can be well obtained.

In addition, in the light-emitting device, a reflective portion having light reflectivity is formed on the substrate.

By providing the reflective portion on the substrate in this way, the light emitted from the opening can be reliably emitted toward the observer. Therefore, the effect can be further promoted.

In addition, in the light-emitting device, a light-absorbing layer is formed between the substrate and the wiring.

In this way, since reflection of external light from the observer side is prevented, an improvement in contrast can be achieved.

In the light-emitting device of the present invention, the functional layer may contain an organic electroluminescence material. That is, according to the present invention, a light-emitting device using an organic EL element as a light-emitting element can be provided.

In addition, the method of manufacturing a light-emitting device of the present invention is a method of manufacturing a light-emitting device provided with a pair of opposing electrodes on a substrate and a functional layer including a light-emitting layer sandwiched between these electrodes. A step of forming, between the substrate and the light-emitting layer, wiring that shields a display region of the substrate, and the wiring has a light-reflective reflective surface on the side of the light-emitting layer.

In addition, it is preferable that an opening through which light emitted from the light emitting layer passes is formed on a side portion of the wiring.

In this way, even if the wiring is formed so as to block the display area, the emitted light is reflected and emitted from the opening, so that the extraction efficiency of the emitted light can be improved. In addition, in the case of enlarging the screen of the light-emitting device, in order to reduce the resistance of the wiring resistance, the line width becomes thicker, and the display area is blocked, which may cause a decrease in the extraction efficiency of emitted light. However, By employing such a configuration, it is possible to suppress a reduction in the extraction efficiency of emitted light. Therefore, since the degree of freedom of the wiring structure and wiring pattern increases, the TFT wiring or the power supply line can be located at a desired position, and a large screen can be easily realized.

In addition, since the emitted light is emitted from the opening formed on the side of the wiring, for example, by patterning the wiring into a desired pattern, the emitted light can be emitted from a desired opening. In addition, when the intensity of the emitted light is uneven due to the shape of the light emitting layer or the electrode, in order to efficiently extract the emitted light, it is possible to actively adjust the pattern of the wiring and form the opening at a desired position. The extraction efficiency of emitted light is further improved.

Furthermore, the above-described manufacturing method is particularly effective in manufacturing a light-emitting device of a so-called bottom emission structure in which emitted light is taken out from the side of a substrate on which TFTs and various wirings are provided.

In addition, the manufacturing method of the light-emitting device further includes a step of forming partitions for partitioning the plurality of light-emitting layers, and a step of forming the light-emitting layers adjacent to the partitions by a droplet discharge method.

In addition, it is preferable to perform a lyophilic treatment or a lyophobic treatment so that the surface of the partition wall becomes relatively lyophilic or lyophobic.

In this way, by using the droplet discharge method to eject the light-emitting layer material near the partition wall, the liquid repellency of the partition wall, the lyophilicity of the substrate, and the evaporation of the solvent of the light-emitting layer material can be used at the contact portion between the partition wall and the light-emitting layer. Sex and other factors, so that it can be contacted at the desired angle. Thus, the uneven surface can be easily formed.

In addition, an electronic device of the present invention is characterized by having the above-mentioned light-emitting device of the present invention.

Here, examples of electronic devices include information processing devices such as mobile phones, mobile information terminals, clocks, word processors, and personal computers.

Therefore, according to the present invention, since it has a display unit using the aforementioned light-emitting device, it is possible to form an electronic device with a display unit capable of displaying a bright, high-quality, high-reliability, high-brightness, and high-contrast image. .

In addition, since the electronic device of the present invention can reduce unevenness in luminance of the light-emitting element, it can be applied, for example, to an electronic device having a large-area display with a diagonal of 20 inches or more.

Description of drawings

FIG. 1 is an overall plan configuration diagram of an organic EL device shown in Embodiment 1 of the present invention.

2 is a partial cross-sectional configuration diagram of the organic EL device shown in Embodiment 1 of the present invention.

3 is a plan view showing a plurality of light emitting elements of the organic EL device shown in Embodiment 1 of the present invention.

4 is a partial cross-sectional configuration diagram of an organic EL device shown in Embodiment 2 of the present invention.

5 is a partial cross-sectional configuration diagram of an organic EL device shown in Embodiment 3 of the present invention.

6 is a partial cross-sectional configuration diagram of an organic EL device shown in Embodiment 4 of the present invention.

7 is a plan view showing main parts of the organic EL device shown in Embodiment 4 of the present invention.

8 is a schematic diagram showing a wiring structure of an organic EL device shown in Embodiment 5 of the present invention.

9 is a plan view schematically showing the configuration of the organic EL device shown in Embodiment 5 of the present invention.

10 is a side sectional view of a display region of an organic EL device shown in Embodiment 5 of the present invention.

11 is an enlarged cross-sectional view of the vicinity of the light-emitting layer of the organic EL device shown in Embodiment 5 of the present invention.

Fig. 12 is a comparison diagram of the power supply line width and the pixel width of the organic EL device shown in Embodiment 5 of the present invention.

13 is a side sectional view of a display region of an organic EL device shown in Embodiment 6 of the present invention.

FIG. 14 is a diagram showing an electronic device including the organic EL device of the present invention.

Among them, 11 element forming layer, 12 substrate (substrate), 13 light-emitting element, 13a light-emitting region, 14 anode (first electrode), 14a inclined face, 15 light-emitting layer, 16 hole injection/transport layer, 17 cathode (second electrode) electrode), 17a light emitting part, 18 TFT for driving, 19 sealing substrate, 20 desiccant, 22 cofferdam (partition wall), 22a contact hole, 22b (cofferdam) inner wall surface, 32 sub-cofferdam (internal partition wall), 32b (sub-cofferdam) inner wall surface, 25 EL layer (functional layer), 100, 110, 120, 130, 140, 150...organic EL device (light emitting device), 34...real display area, 12...substrate, 17a, 63, 81...opening, 14...anode (electrode), 17...cathode (electrode), 84...light emitting layer, 95...reflecting part, 103...power line (wiring), 103a...reflecting surface, OT...concave-convex surface, T...Protrusion (top), O...Concave (bottom), θ...angle, P...contact point (end), A...vertical direction, BM...shading layer (light absorbing layer)

Detailed ways

(Embodiment 1)

Hereinafter, a light-emitting device, a method of manufacturing the light-emitting device, and an electronic device of the present invention will be described with reference to the accompanying drawings.

In addition, the embodiment described below is an example showing one aspect of the present invention, does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. In addition, in each of the drawings shown below, in order to make each layer or each member a size that can be recognized on the drawing, the scale is different for each layer or each member.

1 is a plan view showing the overall structure of an organic electroluminescent (organic EL) device as one embodiment of the light emitting device of the present invention, FIG. 2 is a partial cross-sectional view of the same device, and FIG. 3 shows the same organic EL device. The top view of a plurality of light-emitting elements. The organic EL device of this embodiment is a top emission type in which output light from a light emitting layer is taken out from the element formation side, and is an active matrix organic EL device in which switching elements are provided corresponding to each light emitting element.

First, the overall configuration of the organic EL device according to the present embodiment will be described with reference to FIG. 1 .

The organic EL device 100 of this example is provided with a plan view in which pixel electrodes connected to a light-emitting element drive unit (not shown) are arranged in a matrix on an electrically insulating substrate (substrate) 12 . An approximately rectangular pixel portion 33 (within the single-dot chain line frame in FIG. 1 ). The pixel portion 33 is divided into a central display area 34 (within the two-dot chain line frame in FIG. area). In the display area 34, pixels composed of three-color (R, G, B) light-emitting elements (organic EL elements) 13 each having a pixel electrode are separated in a matrix in the vertical and horizontal directions of the paper. . In addition, scanning line driving circuits 38 are arranged on the left and right of the display area 34 in FIG. 1 , while data line driving circuits 31 are arranged on the upper and lower sides of the display area 34 in FIG. 1 . These scanning line driving circuits 38 and data line driving circuits 31 are arranged on the periphery of the dummy region 35 . In addition, in FIG. 1 , the illustration of the scanning line and the data line is omitted.

In addition, an inspection circuit 30 is disposed above the data line drive circuit 31 in FIG. 1 . The inspection circuit 30 is a circuit for inspecting the operation status of the organic EL device 100, for example, has an inspection information extraction mechanism (not shown) for outputting the inspection result to the outside, and can inspect the organic EL device during manufacture or at the time of sale. Quality defects. Furthermore, this inspection circuit 30 is also arranged inside the dummy region 35 . In addition, an external drive substrate 36 is connected to the substrate 12 , and an external drive circuit 32 is mounted on the external drive substrate 36 .

In addition, when looking at the cross-sectional structure shown in FIG. 2 , a plurality of light-emitting elements (pixels) 13 provided on one surface of the substrate 12 are electrically connected to corresponding light-emitting element drive units 18 . The light-emitting element 13 is provided in a region surrounded by banks (partition walls) 22 erected on the substrate 12, and has an EL layer (functional layer) sandwiched by an anode (first electrode) 14 and a cathode (second electrode) 17. )25. The EL layer 25 has a light emitting layer 15 mainly composed of an organic electroluminescence material, and a hole injection/transport layer 16 . In addition, the element forming surface side of the substrate 12 is covered with a light-transmitting sealing substrate 19 .

In the case of the present embodiment, both the anode 14 and the cathode 17 are formed of a light reflective metal film such as silver, gold, or aluminum, and the cathode 17 is partially formed in the plane area of the anode 14 and in the plane area of each light emitting element 13. It has an opening 17a. Based on this structure, in the region corresponding to the opening 17a of the cathode 17, a part of the anode 14 and the EL layer 25 are exposed to the upper side of the element, and this exposed region forms a light emitting portion that emits the output light of the light emitting element 13. . The three EL layers 25 shown in the figure respectively include, for example, red (R), green (G) and blue (B) three-color light-emitting layers, and these three-color light-emitting elements 13 (pixels) constitute one part of the organic EL device 100. display units.

The bank 22 surrounding the light-emitting element 13 is formed in an approximately trapezoidal cross-section as shown in the figure, and the inner wall surface 22b on the side of the light-emitting element 13 is formed as an inclined surface with respect to the substrate surface. On the top of the bank 22, there is provided a contact hole 22a directly reaching the light-emitting element driving part 18, and the light-emitting element 13 is partially buried in the anode 14 in the contact hole 22a, and the light-emitting element on the element formation layer 11 provided on the lower side is arranged. The element driving unit 18 is electrically connected. The anode 14 and the light emitting element drive unit 18 may be directly connected to each other via the insulating layer 11 . The light-emitting element drive unit 18 is a part that supplies electric energy corresponding to the display tone to the light-emitting element 13. For example, a switching element for selecting a pixel having information on an applied voltage to the light-emitting element 13 in accordance with data supplied from a display circuit, A circuit for applying the voltage supplied from the power supply line to the pixel driving switching element on the light emitting element 13 based on the voltage application information extracted from the pixel selecting switching element.

In addition, the sealing substrate 19 and the substrate 12 are bonded via an adhesive layer (not shown), and the organic EL element 13 is sealed by the sealing substrate 19 and the adhesive layer. In addition, a desiccant 20 for removing moisture in the sealed space is arranged on the inner surface side of the sealing substrate 19 . An inert gas may be filled between the sealing substrate 19 and the substrate 12 without providing an adhesive layer. As described above, the organic EL device 100 shown in FIG. 1 is a top-emission type organic EL device in which light emitted from the light-emitting layer 16 is taken out from the side of the sealing substrate 19 to the outside of the device.

In addition, when looking at the top view structure of FIG. 3 , in each light emitting element 13 , the anode 14 and the EL layer 25 that are rectangular in plan view are arranged inside the bank 22 having an opening that is approximately rectangular in plan view, and have multiple The cathode 17 is formed across a plurality of light emitting elements 13 with rectangular openings (light emitting portions) 17a. The opening 17 a provided in the cathode 17 is arranged at a position substantially overlapping the planar area of the anode 14 formed on the inner wall surface 22 b of the bank 22 . In addition, in the light-emitting elements 13 at both ends, the outside of the cathode 17 in the left-right direction in the drawing also serves as an opening 17 a. In addition, the light-emitting region 13 a of each light-emitting element 13 is formed in the part where the anode 14 and the EL layer 25 overlap with the cathode 17 in the plane of the bank 22 . In order to electrically insulate the anode 14 and the cathode 17 of the light-emitting element 13, the part of the anode 14a formed on the inner wall surface 22b of the bank 22 where the EL layer 25 is not arranged is located in the region of the opening 17a provided on the cathode 17. . In order to reliably electrically insulate the anode 14 and cathode 17 of the light emitting element 13 , an insulating layer (not shown) may be disposed on the anode 14 a formed on the inner wall surface 22 b of the bank 22 .

In the organic EL device 100 of the present embodiment having the above configuration, when power is supplied from the light emitting element driver 18 to the light emitting element 13, the light emitting layer 15 emits light in the light emitting region 13a where the EL layer 25 is sandwiched between the electrodes. Since both the anode 14 and the cathode 17 sandwiching the EL layer 25 are formed using a light-reflective metal film, light generated in the light emitting region 13a travels toward the plane of the EL layer 25 while being emitted between the electrodes. In addition, when the light propagating inside the EL layer 25 reaches the outside of the cathode 17, the light is emitted toward the sealing substrate 19 side from the light emitting portion 17a opened upward in FIG. 2 .

Here, in the light-emitting element 13, since the anode 14 is formed on the substrate 12 and along the inner wall surface 22b inclined relative to the surface of the substrate 12, the anode 14 is formed on both sides of the light-emitting element 13 in an approximate manner standing upward from the substrate surface. boat shape. That is, the anode 14 has the structure which has the inclined surface part 14a, 14a inclined with respect to the board|substrate 12 at the both sides. With this configuration, the light propagating outward from the light emitting region 13a is reflected by the inclined surface portions 14a, 14a of the anode 14, and is efficiently extracted from the light emitting portion 17a.

In this way, the anode 14, which also functions as an emission mechanism for light generated inside, reflects the extracted light above the substrate with high efficiency. The inclination angle of the inclined surface 14a with respect to the substrate surface is preferably 35° to 55°. About 45°. In addition, these inclined surface parts 14a (that is, the inner wall surface 22b of the bank 22) may be formed into a curved shape.

In this way, according to the organic EL device 100 of this embodiment, the light generated in the light-emitting region 13a of the light-emitting element 13 is guided to the light-emitting portion 17a while being reflected by the anode 14 and the cathode 17 sandwiching the EL layer 25. The light emitting portion 17a is taken out upward of the substrate 12 with high directivity. That is, although the present organic EL device is a top emission type organic EL device, since the output light from the light emitting element 13 does not pass through the transparent electrode, the output light can be taken out extremely efficiently. In addition, instead of using a transparent conductive material made of a metal oxide as the second electrode, a material with a low work function including an alkali metal such as Li or Na or an alkaline earth metal such as Be, Mg or Ca can be used as the electron injection layer, Therefore, electrons can be efficiently injected into the light-emitting layer, and the luminance of light from the light-emitting element can be improved. In addition, as the electron injection layer, a relatively thick layer may be used, and a material having low translucency may be used.

In addition, since the anode 14 and the cathode 17 are formed of a metal film, higher reliability can be obtained compared with the conventional structure in which the upper electrode is formed of a transparent conductive material such as ITO. In addition, since the resistance is significantly lower than that of transparent conductive materials, it is difficult to generate a voltage drop in the cathode 17 formed substantially on the entire surface of the display area 34, so even when the screen is enlarged, it is difficult to generate a display. Unequal.

Next, a specific configuration example of each component of the organic EL device 100 will be described.

In the organic EL device 100 shown in FIG. 1 , the substrate 12 may be formed of glass, quartz, sapphire, or synthetic resin materials such as polyester, polyacrylate, polycarbonate, and polyether ketone. In addition to opaque materials, transparent or translucent materials that can transmit light may be used for the substrate 12 , and inexpensive glass is preferably used.

The anode 14 includes a light-reflective metal film (for example, gold, silver, etc.). As the metal film, if gold or silver is used, since the work function is large (preferably 4.6 eV), it is preferable when forming the anode 14 with a single-layer metal film. Alternatively, a laminated structure with another conductive film may also be used. The anode 14 can be formed using a known film-forming method such as a sputtering method or a vapor deposition method.

The cathode 17 includes a light reflective metal film (for example, aluminum, gold, silver, etc.). That is, either these metal films can be formed as a single layer, or on the EL layer 25 side of these metal films, a layer containing a material having a low work function including an alkali metal such as Li or Na or an alkaline earth metal such as Be, Mg or Ca can be provided. . The cathode 17 can be formed by a known film-forming method, but it is preferably formed selectively by a masked vapor deposition method using a metal mask in order not to damage the already provided EL layer 25 during film-forming.

In addition, an antireflection film (antireflection mechanism) may be provided on the outer surface of the cathode 17 . In the case of this embodiment, since the cathode 17 is arranged on the side of the translucent sealing substrate 19 to be recognized by the observer, when the light incident on the organic EL device 100 is reflected by the cathode 17, there is a possibility that the recognition of the display may be changed. However, by providing the anti-reflection film, the reduction in visibility caused by the reflected light can be prevented, and the contrast with the light emitting portion 17a can be improved, contributing to high-quality display. .

The hole injection/transport layer 16 is made of, for example, a polymer material. As a preferable constituent material, examples of the polymer material include polythiophene, polybenzenesulfonic acid, polypyrrole, polyaniline and derivatives thereof. In addition, when a low-molecular-weight material is used, it is preferable to laminate the hole injection layer and the hole transport layer. Examples of the material for the hole injection layer include copper phthalocyanine (CuPc) and polytetrahydrothiocyanate. Polyphenylenevinylene of phenylphenylene, 1,1-bis-(4-N,N-xylanilinophenyl)cyclohexane, tris(8-hydroxyquinoline)aluminum, etc., but especially Preference is given to using copper phthalocyanine (CuPc). In addition, the hole transport layer is composed of triphenylamine derivatives (TPD), pyrazoline derivatives, arylamine derivatives, stilbene derivatives, triphenyldiamine derivatives, and the like. Specifically, there are JP-A No. 63-70257, JP-A No. 63-175860, JP-2-135359, JP-2-135361, JP-2-209988, JP-3-37992, JP-A The compounds described in the 3-152184 communiqué, etc., but preferably triphenyldiamine derivatives, in which 4,4'-bis(N-(3-methylphenyl)-N-aniline) biphenyl group is considered is ideal. Furthermore, either one of the hole transport layer and the hole injection layer may be formed.

As a material for forming the luminescent layer 15 , a high-molecular luminescent substance or a low-molecular organic luminescent dye, that is, a luminescent substance such as various fluorescent substances or phosphorescent substances can be used. Among the conjugated polymers used as light-emitting substances, those having an arylene vinylene or polyfluorene structure are particularly preferable. Among low-molecular-weight emitters, for example, dyes such as naphthalene derivatives, anthracene derivatives, perillene derivatives, polymethines, xanthenes, coumarins, and cyanines, 8-hydroquinoline Metal complexes of derivatives thereof, aromatic amines, tetraphenylcyclopentadiene derivatives, etc., or known substances described in JP-A No. 57-51781 and the same publication No. 59-194393.

Furthermore, between the cathode 17 and the light emitting layer 15, an electron transport layer or an electron injection layer may be provided as necessary. The material for forming the electron transport layer is not particularly limited, and examples thereof include oxadiazole derivatives, anthraquinone dimethane and derivatives thereof, benzoquinone and derivatives thereof, naphthoquinone and derivatives thereof, anthraquinone and derivatives thereof , tetracyanoanthraquinone dimethane and its derivatives, fluorenone derivatives, diphenyldiethyl cyanide and its derivatives, diphenoquinone derivatives, metal complexes of 8-hydroxyquinoline and its derivatives wait. Specifically, the same materials as those used for forming the hole transport layer include JP-A-63-70257, JP-A-63-175860, JP-2-135359, JP-2-135361, and JP-2. - Compounds described in Publication No. 209988, the same No. 3-37992, and the same No. 3-152184, etc., particularly preferably 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1, 3,4-oxadiazole, benzoquinone, anthraquinone, tris(8-hydroxyquinoline)aluminum.

As the sealing substrate 19, for example, a glass substrate can be used, but if it is transparent and has excellent gas barrier properties, a member other than a glass substrate such as a plastic, a plastic laminated film, a laminated molded substrate, or a glass laminated film can also be used. . In addition, a member that absorbs ultraviolet rays can also be used as the protective layer.

The functional layers including the light emitting layer 15 of the organic EL device 100 shown in FIGS. 1 to 3 can be formed using a droplet discharge method (inkjet method). When the functional layer is formed using the droplet discharge method, the banks 22 having openings in a grid-like shape in plan view are formed in regions where the functional layer is to be formed. In addition, the functional layer can be formed at a specific position by discharging the liquid material containing the material for forming the functional layer toward the opening of the bank 22 from the discharge head of the droplet discharge device.

Here, the discharge head of the droplet discharge device includes an inkjet head. The inkjet method may be a piezoelectric inkjet method in which a fluid is ejected using the volume change of a piezoelectric element, or a method using an electrothermal transducer as an energy generating element. Furthermore, a dispenser device may be used as the droplet discharge device. In addition, the liquid material refers to a medium having a viscosity that can be ejected from the nozzle of the ejection head. Either water-based or oil-based. It suffices as long as it has fluidity (viscosity) that can be ejected from a nozzle or the like, and even if a solid substance is mixed, it only needs to be a fluid body as a whole. In addition, the solid matter contained in the liquid material may be dissolved by heating above the melting point, or may be dispersed in a solvent as fine particles. In addition to the solvent, other functional substances such as dyes or pigments may be added. Material.

Although detailed illustrations are omitted, the organic EL device 100 of this embodiment is an active matrix type, and actually, a plurality of data lines and a plurality of scanning lines are formed into the element formation layer 11 in a substantially grid-like plan view. In addition, light emitting elements 13 are connected to each of the pixels arranged in a matrix divided by these data lines or scanning lines via driving TFTs such as switching transistors and drive transistors. When a driving signal is supplied through the data line or scanning line, current flows between the electrodes, the light emitting layer 15 of the light emitting element 13 emits light, and light is emitted from the light emitting portion 17a to the outside of the sealing substrate 19, and the pixel is turned on.

(Embodiment 2)

Next, Embodiment 2 of the present invention will be described with reference to FIG. 4 . FIG. 4 is a partial cross-sectional configuration diagram of the organic EL device 110 of the present embodiment, and corresponds to FIG. 2 of the organic EL device 100 of the previous embodiment. Although the illustration of the sealing substrate is omitted in FIG. 4 , the organic EL device 110 of this embodiment has the same basic structure as the previous organic EL device 100 , and inside the bank 22 that divides each light emitting element, the same The sub-dam (internal partition wall) 32 for further dividing the area is characteristic in this point. Therefore, in the following description and in FIG. 4 , the same reference numerals are used for the same components as those of the previous embodiment, and detailed descriptions will be omitted.

The organic EL device 110 shown in FIG. 4 includes a plurality of light emitting elements 53 . Each light emitting element 53 is provided in a region surrounded by the banks 22 erected on the substrate 12 . Each light emitting element 53 has a configuration in which the EL layer 25 is sandwiched between the anode 14 and the cathode 17 , and is partitioned planarly by the sub-bank 32 provided on the same layer as the bank 22 . In addition, in each region partitioned by the sub-banks 32, a plurality of (two in the drawing) light emitting regions 13a are formed by placing the anode 14 and the cathode 17 in opposition to each other with the EL layer 25 interposed therebetween. The cathode 17 is partially formed in the planar region of the anode 14 similarly to the previous embodiment, so that openings 17a serving as light emitting portions are formed on both sides of the light emitting region 13a. At the position of each opening 17a, the anode 14 formed on the bank 22 and the sub-bank 32 has an inclined surface 14a similar in shape to the inner wall surface of these banks.

The organic EL device 110 of the present embodiment having the above-described structure makes the light-emitting layer 15 in the light-emitting region 13a emit light by using the current supplied from the light-emitting element drive unit 18 conductively connected to the anode 14 through the contact hole, and the light passes through the cathode 17. The light is continuously reflected from the anode 14, guided to both sides of the light-emitting region 13a, and can be output from the light-emitting parts (cathode openings) 17a provided at multiple positions. The anode 14 and the light emitting element drive unit 18 may be directly connected to each other via the insulating layer 11 . In this way, by dividing the light emitting element 13 on a plane and providing a plurality of light emitting regions 13a and corresponding light emitting portions 17a, even when a relatively large pixel is formed, high brightness can be obtained. Take out efficiency. Therefore, according to the organic EL device 110 of this embodiment, a large-screen display with high brightness can be realized.

In addition, in this embodiment, it is preferable that the inclined surface portion 14a of the anode 14 formed on the light emitting portion 17a forms an angle of about 45° with the main surface of the substrate 12 . That is, the inner wall surface 32b of the sub-bank 32 preferably forms an angle of about 45° with the substrate surface. By adopting such a configuration, the luminance is maximized in the front direction of the organic EL device 110, and a high-brightness display can be obtained in the direction of the observer.

(Embodiment 3)

Next, Embodiment 3 of the present invention will be described with reference to FIG. 5 . FIG. 5 is a partial cross-sectional configuration diagram of the organic EL device 120 of the present embodiment, and corresponds to FIG. 2 of the organic EL device 100 of the previous embodiment.

In addition, the illustration of the sealing substrate is omitted in FIG. 5 , and in this embodiment, configurations different from those of the previous embodiment will be described, and the description will be simplified by using the same reference numerals for the same configurations.

The organic EL device 120 of this embodiment has the same basic configuration as the organic EL device 100 described above, including a bank (partition wall) 60 , a cathode (second electrode) 62 , and an interlayer insulating film 64 as shown in FIG. 5 .

Here, the bank 60 has a structure in which a first bank layer 60 a , a second bank layer 60 b , and a third bank layer 60 c are sequentially stacked on an interlayer insulating film 64 . In addition, the first bank layer 60a is formed to have an approximately trapezoidal cross-section as shown in the figure in order to surround the light emitting element 13, and the inner wall surface 60d on the light emitting element 13 side is an inclined surface with respect to the substrate surface. In addition, the second bank layer 60b is a reflective film formed in imitation of the shape of the first bank layer 60a, and is composed of a light reflective metal film such as silver, gold, or aluminum. In addition, the third bank layer 60c is a transparent resin film formed in imitation of the shape of the second bank layer 60b, and is composed of a resin film such as acrylic. Therefore, the bank 60 becomes a part of the surface which is approximately trapezoidal in cross-section and has light reflectivity and insulating properties.

In addition, the cathode 62 has a structure in which a transparent conductive film 62a and an auxiliary electrode 62b are laminated. In addition, the transparent conductive film 62a is a transparent conductive film such as indium tin oxide (hereinafter abbreviated as ITO). In addition to ITO, materials containing zinc (Zn) in metal oxides, such as indium oxide and zinc oxide-based amorphous transparent conductive films (Indium Zinc Oxide: IZO) (registered trademark)) (Idemitsu Kosan corporation). Such a transparent conductive film 62 a is a film formed on the entire surface of the substrate 12 including the EL layer 25 and the bank 60 .

In addition, the auxiliary electrode 62b is a part formed locally on the transparent conductive film 62a in the planar area of each light emitting element 13 . In addition, these auxiliary electrodes 62b have higher conductivity than the transparent conductive film 62a, and assist the conductivity of the transparent conductive film 62a. In addition, by partially forming the auxiliary electrode 62b on the transparent conductive film 62a in this way, the opening 63 is formed on the side of the auxiliary electrode 62b. In addition, such openings 63 are formed in the planar area of each light emitting element 13 . In these openings 63, as will be described later, the emitted light from the light emitting layer 15 passing through the transparent conductive film 62a can pass through, and the emitted light reflected multiple times between the anode 14 and the auxiliary electrode 62b can pass through. It passes through the transparent conductive film 62a. With this configuration, a part of the EL layer 25 is in contact with the transparent conductive film 62a on the region corresponding to the opening 63 of the auxiliary electrode 62b, and this contact region forms a light emitting portion that emits output light from the light emitting element 13. The three EL layers 25 shown in the figure each include, for example, red (R), green (G) and blue (B) three-color light-emitting layers, and these three-color light-emitting elements 13 (pixels) constitute one part of the organic EL device 100. display units.

In addition, the interlayer insulating film 64 is an insulating film provided between the anode 14 and the light-emitting element drive unit 18 , and the anode 14 and the light-emitting element 18 are connected through contact holes 64 a formed in these interlayer insulating films 64 .

A method of manufacturing such an organic EL device 120 will be described.

First, after forming the light emitting element driving portion 18, the interlayer insulating film 64 and the contact hole 64a are formed. Then, a reflective anode 14 (ITO formed after forming an Al film, or other metal films, silver, gold, and other metals with high reflectivity and a work function of 4.6 eV or more) is formed. Then, the first bank 60 a is formed using an acrylic resin so that the helix angle becomes about 45 degrees. Then, a reflective metal film is deposited to form the second bank 60b. Then, the third bank 60c is formed so as to cover the second bank 60b. Next, the EL layer 25 is formed. If necessary, an electron blocking layer, a hole transport layer, an electron transport layer, an electron injection layer, and a hole blocking layer are formed. Then, a transparent conductive film 62a is formed in a laminated structure of Ca/ITO or the like, and then a reflective auxiliary electrode 62b is vapor-deposited with a metal such as Al through the mask to open the opening 63 as shown in FIG. 5 .

In the organic EL device 120 thus constituted, electric energy is supplied to the EL layer 25 sandwiched between the anode 14 and the cathode 62 . In this way, electric energy is supplied to the EL layer 25 sandwiched between the anode 14 and the transparent conductive film 62 a , and the auxiliary electrode 62 b assists the conductivity of the transparent conductive film 62 a to supply electric energy to the EL layer 25 . In addition, in the EL layer 25 supplied with electric energy in this way, emitted light can be generated, and the emitted light can be reflected multiple times between the anode 14 and the auxiliary electrode 62b, and at the same time, the emitted light can be reflected by the second bank dam 60b to emit light. The light propagates in the plane direction in the EL layer 25 and the transparent conductive film 62a. In addition, the emitted light that has finally passed through the transparent conductive film 62 a is emitted from the opening 63 to the outside of the organic EL device 120 .

As described above, in the organic EL device 120 of this embodiment, the emitted light from the EL layer 25 can be reflected multiple times between the anode 14 and the auxiliary electrode 62b, and the emitted light can be reflected by the second bank 60b, and the The emitted light propagates in the plane direction through the EL layer 25 and the transparent conductive film 62a. In addition, emitted light can be emitted from the opening 63 through the transparent conductive film 62 a.

In addition, in the organic EL device 120, since the auxiliary electrode 62b improves the conductivity of the transparent conductive film 62a, electric energy can be efficiently supplied to the EL layer 25, and the emitted light can be extracted efficiently, thereby realizing a bright display. show. In addition, since the transparent conductive film 62a is formed on the entire surface of the EL layer 25, the contact area with the EL layer 25 can be increased compared with the case where electrodes are formed in contact with a part of the EL layer 25. In this way, compared with the case where electrodes are formed locally on the EL layer 25, the light emitting area can be increased.

Therefore, as described above, since the conductivity of the transparent conductive film 62a is assisted by the auxiliary electrode 62b, the conductivity can be improved, and the light emitting area can be increased, thereby further improving the luminous efficiency.

(Embodiment 4)

Next, Embodiment 4 of the present invention will be described with reference to FIGS. 6 and 7 . FIG. 6 is a partial cross-sectional configuration diagram of the organic EL device 130 of the present embodiment, and corresponds to FIG. 2 of the organic EL device 100 of the previous embodiment. FIG. 7 is a plan view showing the main part of the organic EL device 130, and is a diagram for explaining the positional relationship of the auxiliary electrode, the anode, and the bank.

In addition, in FIG. 6 , the illustration of the sealing substrate is omitted, and in this embodiment, configurations different from those of the previous embodiment will be described, and the same configurations will be assigned the same reference numerals, and descriptions will be omitted.

An organic EL device 130 according to the present embodiment has the same basic configuration as the above-mentioned organic EL device 120 and a bank (partition wall) 70 as shown in FIG. 6 .

Here, the bank 70 has a structure in which a lyophilic bank layer 70 a and a lyophobic bank layer 70 b are sequentially laminated on the interlayer insulating film 64 . In addition, the lyophilic bank layer 70a is a layer made of a highly lyophilic inorganic material such as silicon oxide, and the lyophobic bank layer 70b is a layer made of an acrylic resin material subjected to fluorine plasma treatment. In this bank dam 70, when the EL layer 25 is formed by the droplet discharge method, the EL layer 25 stays on the anodes 14 by the lyophilic bank layer 70a, so that the EL layer 25 can be formed on these anodes 14. In addition, even if the liquid material ejected from the ejection head produces flight bending and the liquid material is coated on the lyophobic bank layer 70b, the lyophobic property of the lyophobic bank layer 70b can be used to make the Liquid material flows over the anode 14 .

In addition, the organic EL device 130 of this embodiment has a configuration in which a plurality of openings 63 are formed for each light emitting element 13 . Specifically, as shown in FIGS. 6 and 7 , in the light-emitting element 13 surrounded by the bank 70 , a plurality of auxiliary electrodes 62 b are branched to form a plurality of side openings 63 of the auxiliary electrodes 62 b.

In such a configuration, light can be emitted from more openings 63 than in the organic EL device 120 . Here, by branching the auxiliary electrode 62 b into a desired pattern, light can be emitted from a desired opening 63 . In addition, when the intensity of the emitted light is uneven due to the shape of the light emitting layer 15, in order to efficiently extract the emitted light, by actively branching the auxiliary electrode 62b and forming the opening 63 at a desired position, it is possible to further improve the intensity of the emitted light. Extraction efficiency of emitted light. In addition, since multiple reflections can be avoided with the above configuration, attenuation of emitted light due to these multiple reflections can be suppressed.

Therefore, in the organic EL device 130 of the present embodiment, not only the same effects as those of the organic EL device 120 described above can be obtained, but also the attenuation of emitted light can be suppressed, thereby further improving the luminous efficiency.

In each of the above-mentioned embodiments, although the active matrix organic EL device was used for description, it is not limited to the active matrix organic EL device, and can be applied to simple matrix organic EL devices and passive matrix organic EL devices. device. In each of the above-described embodiments, an organic EL device having an organic EL element as a light-emitting element has been cited and described, but the technical scope of the present invention is not limited to the above-described embodiments, and it is of course applicable to devices using organic EL devices other than organic EL devices. In the case of a light-emitting element, it is particularly ideal for use in an organic EL device in which light is emitted from the top side of the substrate on which the light-emitting element is arranged.

(Embodiment 5)

FIG. 8 is a schematic diagram showing the wiring structure of the organic EL device of the present embodiment.

The organic EL device (light emitting device) 140 is an active matrix organic EL device using a thin film transistor (Thin Film Transistor, hereinafter abbreviated as TFT) as a switching element.

As shown in FIG. 8 , the organic EL device 140 has a plurality of scanning lines 101 . . . , a plurality of signal lines 102 . The lines 103... are respectively wired, and pixel regions X... are provided in the vicinity of intersections of the scanning lines 101... and the signal lines 102....

A data line drive circuit 32 including a shift register, level shift diodes, video lines, and analog switches is connected to the signal line 102 . Also, a scanning line driver circuit 38 including a shift register and level shift diodes is connected to the scanning line 101 .

In addition, in each pixel region X, there are provided a switching TFT 112 for supplying a scanning signal to the gate electrode via the scanning line 101, and a storage capacitor 113 for holding the pixel signal supplied from the signal line 102 via the switching TFT 112. The pixel signal held by the capacitor 113 is supplied to the gate electrode of the light-emitting element driving unit 18, and the anode (electrode) 23 through which the driving current flows from the power supply line 103 when the light-emitting element driving unit 18 is electrically connected to the power supply line 103 is sandwiched. into the luminescent functional layer 82 between the anode 14 and the cathode 17. In the light-emitting functional layer 82 , a light-emitting phenomenon occurs by combining holes and electrons injected from the anode 14 and the cathode 17 .

According to this organic EL device 140, when the scanning line 101 is driven and the switching TFT 112 is turned on, the potential of the signal line 102 at this time is held by the holding capacitor 113, and the light-emitting element driving part is determined based on the state of the holding capacitor 113. 18 on and off states. In addition, the current flows from the power supply line 103 to the anode 14 through the channel of the light-emitting element driving unit 18 , and the current flows to the cathode 17 through the light-emitting functional layer 82 . The light emitting functional layer 82 emits light according to the amount of current flowing therethrough. Therefore, since light emission is controlled on/off by each anode 14..., the anode 14 becomes a pixel electrode.

Next, specific forms of the organic EL device 140 of this embodiment will be described with reference to FIGS. 9 to 12 . 9 is a top view schematically showing the structure of the organic EL device 140, FIG. 10 is a side sectional view of display regions R, G, and B in FIG. 12 is a diagram comparing the width of the power line and the width of the pixel.

As shown in FIG. 9 , an organic EL device 140 according to the present embodiment includes: an electrically insulating substrate 12 , an anode 14 connected to a switching TFT not shown in the figure...arranged in a matrix on the substrate 12 and formed. The pixel electrode area not shown, the power supply line 103 ... (refer to FIG. 8 ) arranged around the pixel electrode area and connected to each anode 14 ... (refer to FIG. 8 ), and the substantially rectangular pixel portion 33 in plan view located at least on the pixel electrode area (within the dot-dash line frame in the figure), the data line drive circuit 31. In addition, the pixel portion 33 is divided into a real display area 34 in the center (inside the two-dot chain line frame in the figure), and a dummy area 35 (between the single-dot chain line and the double-dot chain line) arranged around the real display area 34 . area) is divided.

In the real display area 34, the display areas R, G, and B each having the anodes 14... are separately arranged. In addition, scanning line drive circuits 38 are arranged on both sides of the real display area 34 in the drawing. The scanning line driving circuit 38 is provided below the dummy region 35 .

In addition, the inspection circuit 30 is arranged on the upper side in the figure of the real display area 34 . The inspection circuit 30 is provided below the dummy region 35 . This inspection circuit 30 is a circuit for inspecting the operation status of the organic EL device 140, and has, for example, an inspection information output mechanism (not shown) that outputs the inspection result to the outside, so that the quality of the organic EL device during manufacture or at the time of sale can be checked. , Defect inspection.

The driving voltages of the scanning line driving circuit 38 and the inspection circuit 30 are applied to the light emitting element driving unit 18 from a specific power supply unit via the power supply line 103 (see FIG. 10 ). In addition, drive control signals or drive voltages to these scanning line drive circuits 38 and inspection circuits 30 are applied from a specific main driver or the like in charge of operation control of the organic EL device 140 . In addition, the driving control signal at this time refers to a command signal from the main driver or the like related to the output of the signal from the scanning line driving circuit 38 and the inspection circuit 30 .

As shown in FIG. 10 , the organic EL device 140 is constituted by bonding the substrate 12 and the sealing substrate 19 via a sealing resin 19 a. In a region surrounded by the substrate 12 , the sealing substrate 19 , and the sealing resin 19 a, a desiccant is inserted, and an inert gas-filled layer filled with an inert gas such as nitrogen gas is formed.

Since light is taken out from the substrate 12 side in a substrate side emission type (bottom emission type) organic EL device, a transparent or translucent material is used for the substrate 12 . For example, glass, quartz, resin (plastic, plastic film), etc. are mentioned, and it is especially preferable to use a bonded soda glass substrate.

In addition, a light-shielding layer (light-absorbing layer) BM made of a light-absorbing material such as chromium oxide or titanium oxide is formed on the base of the light-emitting element driving unit 18 or the base of the power supply line 103 . In addition, a transparent insulating layer 80 is formed around these light-shielding layers BM.

As the sealing substrate 19, for example, an electrically insulating plate-shaped member can be used. In addition, the sealing resin 19a is made of, for example, a thermosetting resin or an ultraviolet curable resin, and is particularly preferably formed of an epoxy resin which is a kind of thermosetting resin.

In addition, on the substrate 12, the light emitting element drive part 18... for driving the anode 14..., the power line 103..., the interlayer insulating film 64, and the opening part 81 are formed.

The light emitting element driver 18 ... is a switching element formed by using a known TFT manufacturing technique, and is a member in which a silicon film doped with impurities, a gate electrode, a gate insulating film, and the like are stacked. In addition, the light emitting element drive units 18 ... are provided corresponding to the positions of the display regions R, G, and B, and are respectively connected to the anodes 14 ... as will be described later.

The interlayer insulating film 64 is preferably formed of a transparent resin material, and is preferably formed of a material with good workability. For example, it is preferably formed of a thermosetting resin or an ultraviolet curable resin, and as an example of these, an epoxy resin or an acrylic resin, which are one type of thermosetting resin, can be preferably used. In addition, in the interlayer insulating film 64 , the interface with the anode 14 ... is preferably planarized with high precision, and in order to achieve this planarization, it may be formed by laminating through a plurality of steps. In addition, on the interlayer insulating film 64, contact holes C are formed corresponding to the positions of the light emitting element driving parts 18... and the anodes 14..., and the light emitting element driving parts 18... It is connected to the anode 14....

In addition, the various circuit parts covered with the interlayer insulating film 64 include the scanning line driving circuit 38, the inspection circuit 30, and a driving voltage conduction part or a drive control signal conduction part for connecting and driving them.

The power line 103 is a member for supplying electric energy to the light-emitting functional layer 101 according to the on/off state of the light-emitting element driver 18, and is preferably formed of a low-resistance metal material, for example, Al-based metal. In addition, the reflective surface 103a which has light reflectivity is formed in the surface of these power lines 103.... In addition, these reflective surfaces 103a have light scattering properties.

In addition, as shown in FIG. 12, the width W2 of the power supply line 103... and the width W1 of the pixel are, for example, as opposed to the case where the pixel width W1 is 45 μm, and the width W2 of the power supply line is preferably 10 μm or less. Also, when it is necessary to increase the power supply line width W2 in order to reduce the resistance of the power supply lines 103 ..., it is preferable to divide the power supply lines 103 ... into a plurality of lines. For example, when the total width of the power supply lines 103... is 20 μm, it is preferable to divide them into four lines with a line width of 5 μm. Alternatively, when the pixel width W1 is 50 μm and the power supply line width W2 is 10 μm, it is preferable to set the number of power supply lines to two. Moreover, the braid shape which divided|segmented the power cord 103... into several pieces can also be employ|adopted.

The opening 81 is formed adjacently between the light-emitting element driver 18 ... and the power supply line 103 ..., and is a portion for passing light emitted from the light-emitting functional layer 82 to the real display area (display area) 4 side. In addition, the opening area of the opening 81 should be determined according to the planar area corresponding to the throughput of emitted light or the resistance value of the power line 103... It is determined by design matters such as the multiple reflection effect of the emitted light.

In addition, the surface of the interlayer insulating layer 21 on which the anode 14 ... is formed is covered with the anode 14 ..., the lyophilicity control layer 90 mainly composed of a lyophilic material such as SiO ₂ , and the surface formed of acrylic resin or polyimide resin. The cofferdam layer (next door) 91 ... covers. The bank layers 91 . . . are arranged two-dimensionally between the anodes 14 . In addition, the term "lyophilicity" of the lyophilicity control layer in this embodiment means that it is more lyophilic than at least materials such as acrylic resin and polyimide resin constituting the bank layer 91 .

In addition, the light-emitting element drive unit 18 is connected to the anodes 14 .

The light-emitting functional layer 82 has a multilayer structure sandwiched between the anode 14 and the cathode 17, and a hole injection layer 83 and a light-emitting layer 84 (84R, 84G, 84B) are formed in this order from the anode 14 side.

The anode 14 is made of ITO, injects holes into the light-emitting layer 84 by an applied voltage, has a high work function, and has conductivity. The material used to form the anode 14 is not limited to ITO, and in the case of a sealed side-emission type organic EL device, it is not necessary to use a translucent material, as long as it is an appropriate material. In addition, in the case of a substrate-side emission type organic EL device, known materials having translucency can be used. For example, metal oxides can be mentioned, and indium tin oxide (ITO) or materials containing zinc (Zn) in metal oxides can be used, such as indium oxide zinc oxide-based amorphous transparent conductive film (Indium Zinc Oxide: IZO ) (registered trademark)) (manufactured by Idemitsu Kosan Co., Ltd.).

The hole injection layer 83 is a kind of conductive polymer material, is a material for constituting the hole injection layer for injecting holes from the anode 14 into the light-emitting layer 84 , and has a film thickness of 30 nm. As an example of the material forming such a hole injection layer, various conductive polymer materials can be suitably used, for example, PEDOT:PSS, polythiophene, polyaniline, polypyrrole, etc. can be used.

The light-emitting layer 84 generates fluorescence by combining holes injected from the anode 14 through the hole injection layer 83 and electrons injected from the cathode 17 . As a material for forming the light emitting layer 84, known light emitting materials capable of generating fluorescence or phosphorescence can be used. Specifically, polyfluorene derivatives (PF), (poly)paraphenylene vinylene derivatives (PPV), polyphenylene derivatives (PP), polyparaphenylene derivatives (PPP ), polyvinylcarbazole (PVK), polythiophene derivatives, polymethylphenylsilane (PMPS) and other polysilanes. In addition, these polymer materials can also be doped with polymer materials such as perillene dyes, coumarin dyes, and rhodamine dyes, such as rubrene, perillene, 9,10-bis Phenyl anthracene, tetraphenylbutadiene, Nile red, coumarin 6, quinacridone and other materials.

In addition, the organic EL device 140 of this embodiment can perform color display. That is, in each of the display regions R, G, and B corresponding to the three primary colors of light, light emitting layers 84 are formed corresponding to the three primary colors, constituting light emitting layers 84R, 84G, and 84B.

Next, the cross-sectional shape of the light emitting layer 84 will be described with reference to FIG. 11 .

As shown in FIG. 11 , the luminescent layer 84 has a concave-convex surface OT having a convex portion (top) T and a concave portion (bottom) O on its upper portion, and has a contact point with the bank layer 91 at the end of the convex portion T. (end) P. At the contact point P, the angle θ formed by the perpendicular line A extending in the vertical direction of the substrate 12 and the concave-convex surface OT is not less than 30° and not more than 50°. These angles θ are determined by adjusting the liquid repellency of the surface of the bank layer 91 with respect to the material liquid of the light emitting layer 84 . Therefore, the angle θ is properly set. In addition, the convex portion T is formed at a position corresponding to the opening portion 81 .

As shown in FIG. 10 , the cathode 17 has an area larger than the total area of the real display area 34 and the dummy area 35 , and is formed so as to cover both. The cathode 17 serves as a counter electrode of the anode 14 and has a function of injecting electrons into the light emitting layer 84 . As a material for forming the cathode 17, a laminate is used, that is, for example, calcium metal or an alloy mainly composed of calcium is laminated on the light emitting layer 84 side as the first cathode layer, and aluminum or aluminum is laminated thereon. An alloy or silver or silver-magnesium alloy as the main component is used as the second cathode layer. Furthermore, the second cathode layer covers the first cathode layer to protect it from chemical reaction with oxygen or water, and is provided to improve the conductivity of the cathode 17 . Therefore, a single-layer structure may be used as long as it is chemically stable and has a low work function, and is not limited to metal materials.

In addition, the cathode 17 has a reflective surface on the light emitting layer 84 side, so that the light emitted from the light emitting layer 84 can be reflected toward the real display region 34 side. Furthermore, the cathode 17 itself may be formed of a reflective material.

In addition, the reflective surface of the cathode 17 is a curved surface corresponding to the concave-convex surface OT of the luminescent layer 84. For example, the reflective surface formed on the convex portion T of the luminescent layer 84 functions as a mirror that condenses the emitted light to the real display area 34. effect.

In the organic EL device 140 having such a constitution, when a driving current flows into the anode 14 of the light-emitting functional layer 82 from the power supply line 103 (refer to FIG. 8 ), a potential difference is generated between the anode 14 and the cathode 17. The holes in the cathode pass through the hole injection layer 83 and are injected into the light emitting layer 84, and the electrons in the cathode 17 are injected into the light emitting layer 84, so the light emitting layer 84 emits light through the combination of the holes injected into the light emitting layer 84 and the electrons. In addition, the light emitted from the light emitting layer 84 may directly pass through the opening 81 and be emitted toward the real display region 34 , or may collide with the power line 103 . . . Here, since the reflective surface 103a is formed on the power supply line 103..., the emitted light is reflected by the reflective surface 103a of the power supply line 103... Multiple reflections are generated in the light-emitting layer 84 , propagate in the horizontal direction of the light-emitting layer 84 , and then emit from the opening 81 . In addition, since the reflective layer 103a has light-scattering properties, emitted light colliding with the reflective surface 103a is scattered, thereby suppressing attenuation of emitted light due to multiple reflections. In addition, since the cathode 17 is formed corresponding to the uneven surface OT of the light emitting layer 84, the cathode 17 has a curved reflective surface. In addition, since the protrusion T corresponds to the position of the opening 81 , the reflective surface of the cathode 17 is formed at a position corresponding to the opening 81 . Therefore, the emitted light reflected by the reflective surface of the cathode 17 is collected and emitted from the opening 81 with increased intensity.

As described above, in the organic EL device 140 of the present embodiment, the power supply lines 103 ... arranged so as to block the real display area 34 are provided, and these power supply lines 103 ... have the reflective surface 103 a. Since the opening 81 is formed on the side, even if the power line 103 ... is formed in such a way as to block the real display area 34, the emitted light is reflected and emitted from the opening 81, thereby improving the extraction efficiency of the emitted light. . In addition, in the case of enlarging the screen of the organic EL device 140, although the line width of the power line 103... is thickened in order to reduce the resistance of the wiring resistance, the real display area 34 may be blocked, resulting in a problem of light emission. However, the reduction in the extraction efficiency of emitted light can be suppressed by adopting the above configuration. Therefore, since the degree of freedom of the wiring structure and wiring pattern increases, the light-emitting element drive unit 18... or the various types of switching TFTs 112 or the power supply line 103... are located at desired positions, and large-screen display can be easily implemented. change.

In addition, since the emitted light is emitted from the opening 81 , for example, by forming the power line 103 ... in a desired pattern, the emitted light can be emitted from the desired opening 81 . In addition, when the intensity of the emitted light is uneven due to the shape of the light emitting layer 84 or the cathode 17, in order to efficiently extract the emitted light, the opening 81 is formed at a desired position by actively adjusting the pattern of the power supply line 103... , the extraction efficiency of the emitted light can be further improved. In addition, the above configuration is particularly effective in a so-called bottom emission structure in which emitted light is taken out from the side of the substrate 12 on which the light emitting element driver 18 ... or various wirings are provided.

In addition, the power supply line 103... may be branched and formed.

By branching the power supply lines 103 into a plurality in this way, a plurality of openings 81 are formed. In this way, emitted light can be emitted from these openings 81 . Here, by branching and forming the power line 103 in a desired pattern, emitted light can be emitted from a desired opening 81 . In addition, when the intensity of the emitted light is uneven due to the shape of the light emitting layer 84 or the cathode 17, in order to efficiently extract the emitted light, the opening 81 is formed at a desired position by actively branching the power line 103 ... , the extraction efficiency of the emitted light can be further improved. In addition, since multiple reflections can be avoided with the above configuration, attenuation of emitted light due to these multiple reflections can be suppressed.

In addition, since the reflective surface 103a has light scattering properties for scattering emitted light, the emitted light colliding with the reflective surface 103a can be scattered. Therefore, deviation of the reflection direction of emitted light can be prevented. In addition, since multiple reflections can be avoided by having light-scattering properties so as not to reflect emitted light toward the light-emitting layer 84 side, attenuation of emitted light due to these multiple reflections can be suppressed.

In addition, since the cathode 17 has light reflectivity, the emitted light emitted from the light emitting layer 84 to the cathode 17 or the emitted light reflected by the power supply line 103 . . . can be reflected to the power supply line 103 .

In addition, since the light emitting layer 84 has the concave-convex surface OT, it is possible to emit light corresponding to the shape of the concave-convex surface OT. In addition, since the light-reflective cathode 17 is formed so as to cover the uneven surface OT, emitted light can be emitted in the direction normal to the uneven surface OT. In addition, since the convex portion T or the concave portion 0 of the concave-convex surface OT corresponds to the opening 81 , emitted light can be reflected toward the opening 81 .

In addition, by forming the concave-convex surface OT in a desired shape, it is possible to condense emitted light to a desired position, thereby partially increasing the luminous intensity. In addition, the extraction efficiency of the emitted light can be further improved by causing such emitted light to be directly emitted from the opening 81 or emitted after being reflected to an arbitrary position.

In addition, since the value of the angle θ at the contact point P where the concave-convex surface OT of the light emitting layer 84 contacts the bank layer 91 is 30° to 50°, the above effect can be further promoted.

In addition, since the light-shielding layer BM is formed to prevent reflection of external light from the viewer's side viewing the real display 34, contrast can be improved.

Moreover, in the above structure, although the anodes 14... are made of a transparent conductive film made of ITO, it is also possible to form these anodes 14... using a light reflective conductive film. There are slits in the corresponding positions.

In this way, after multiple reflections between the anode 14... and the cathode 17, the emitted light can be taken out from the slit.

In addition, among the above configurations, a configuration in which an electron injection/transport layer is provided between the light emitting layer 84 and the cathode 17 may also be adopted. Here, the electron injection/transport layer is preferably thick enough to have light transparency. In this way, the emitted light reflected by the cathode 17 is not shielded, so that the reduction of the luminous intensity can be prevented.

The electron injection/transport layer is a layer that plays the role of injecting electrons into the light-emitting layer 84, and its forming material is not particularly limited, and examples thereof include oxadiazole derivatives, anthraquinone dimethane and its derivatives, benzoquinone and its derivatives. Derivatives, naphthoquinone and its derivatives, anthraquinone and its derivatives, tetracyanoanthraquinone dimethane and its derivatives, fluorenone derivatives, diphenyldiethylcyanide and its derivatives, diphenoquinone derivatives Compounds, metal complexes of 8-hydroxyquinoline and its derivatives, etc. Specifically, the same materials as those used for forming the hole transport layer include JP-A-63-70257, JP-A-63-175860, JP-2-135359, JP-2-135361, and JP-2. - Compounds described in Publication No. 209988, the same No. 3-37992, and the same No. 3-152184, etc., particularly preferably 2-(4-biphenyl)-5-(4-tert-butylphenyl)-1, 3,4-oxadiazole, benzoquinone, anthraquinone, tris(8-hydroxyquinoline)aluminum.

(Manufacturing method of organic EL device)

Next, a method of manufacturing the above-mentioned organic EL device 140 will be described with reference to FIG. 10 .

First, a chromium oxide or titanium oxide film is formed as a light-shielding layer BM on the substrate 12, and patterning is performed so that light extraction portions are left out. Then, if necessary, an insulating layer 80 is formed of SiO ₂ or the like, and scanning lines 101, signal lines 102..., power lines 103..., storage capacitors 113, switching TFTs 112, and light-emitting element driving parts 18 are formed thereon. In addition, a data line driving circuit 32 and a scanning line driving circuit 38 are formed near the end of each wiring. In addition, the distance between the light emitting element drive unit 18 and the power supply line 103... is as wide as possible. In this embodiment, this distance is set to 10 μm.

Then, an interlayer insulating film 64 is formed. The film thickness of the interlayer insulating film 64 is preferably 100 nm or more. When these films are not thick enough, the wavelength of emitted light may vary and a desired color of emitted light may not be achieved. Therefore, in order to reliably display RGB colors, it is preferable to form the interlayer insulating film 64 with a sufficient film thickness. In addition, by adjusting the film thickness of the interlayer insulating film 64, the distance from the light emitting layer 84 to the reflection surface 103a of the power line 103... and the emission wavelength can be appropriately adjusted. That is, it is preferable to determine the film thickness of the interlayer insulating film in consideration of the wavelength region. In addition, the film thickness of the interlayer insulating film 64 is adjusted according to the refractive index of the transparent material through which emitted light passes. In addition, since the upper surface of the interlayer insulating film 64 is preferably planarized, the interlayer insulating film 64 may be formed in a plurality of steps.

Then, on the interlayer insulating film 64, ITO which will become the anode 14... is deposited and patterned.

Here, it is preferable to form the contact hole C in the interlayer insulating film 64 in advance. By forming the anodes 14... in this way, the drain electrode of the light emitting element driver 18... and the anodes 14... are connected. Furthermore, the anode 14... may be formed at a desired position by discharging and drying the material ink by a printing method or an inkjet method.

Then, after SiO ₂ is formed as an inorganic insulating film for defining the opening of the pixel, patterning is performed to form the lyophilicity control layer 90 .

Then, the bank layer 91 is formed by forming a resin material into a film on the lyophilicity control layer 90 and performing patterning (step of forming a partition wall). Here, the film thickness of the bank layer 91 is set to 50 nm. Specifically, for example, after the organic layer is formed by applying a solution in which a resist such as an acrylic resin or polyimide resin is dissolved in a solvent by various coating methods such as spin coating and dip coating, the organic layer is formed. Patterning can be performed by etching or the like. However, it is more preferable to discharge and dry the material ink by the printing method or the inkjet method (material discharge method), since it does not require a patterning process and there is no waste of material. Here, when the film thickness of the bank layer 91 is 100 nm or more, the shape of the organic layer in the pixel after drying becomes flat, and the emission efficiency decreases. Therefore, if possible, the film thickness is preferably 50 nm or less. In addition, instead of the bank layer 91 as a thin lyophobic film, after performing a lyophobic treatment, only the pixel openings may be irradiated with UV (ultraviolet rays having a wavelength of 300 nm or less). As the lyophobic treatment agent, a titanium coupling agent or a silane coupling agent having a fluorinated alkyl group can also be used.

In the case of subdividing the power supply line into a braid shape and emitting light from the gaps, the thickness of the bank 91 is not limited to this, in order to reduce the parasitic capacitance between the TFT or wiring and the cathode to a negligible level The thickness of the bank dam 91 is preferably 1 to 2 μm.

Then, after irradiating the entire surface with oxygen plasma as a lyophilic treatment, CF4 plasma is irradiated in order to lyophobicize only the surface of the bank layer 91 .

Then, the hole injection layer 83 and the light emitting layer 84 are formed by using an inkjet method (droplet discharge method) (step of forming a light emitting layer adjacent to the partition wall). That is, the hole injection layer 83 was formed by ejecting PEDOT:PSS ink adjacent to the bank layer 91 as a hole injection material, drying, and firing at 200° C. . In addition, as the light emitting layer 84 , materials emitting red, green, and blue light are sequentially ejected so as to be adjacent to the bank layer 91 to form three primary colors.

Then, the reflective cathode 17 is formed by vapor deposition, and the passivation film 85 is subsequently formed. In addition, the sealing substrate 19 is bonded by adding a desiccant (not shown), that is, the organic EL device 140 is completed.

As described above, in the method of manufacturing the organic EL device 140 according to this embodiment, the same effects as those of the organic EL device 140 described above are exhibited.

In addition, since there is a step of forming the bank layer 91 and a step of forming the light emitting layer 84 adjacent to the bank layer 91 by the inkjet method, at the contact point P between the bank layer 91 and the light emitting layer 84, the Depending on various factors such as the lyophobicity of the barrier layer 91, the lyophilicity of the substrate, and the evaporation of the material solvent of the light emitting layer 84, they are brought into contact at a desired angle. Therefore, the uneven surface OT can be easily formed.

(Embodiment 6 of light emitting device)

Next, Embodiment 6 of the light-emitting device of the present invention will be described with reference to FIG. 13 .

In addition, in the present embodiment, the same reference numerals are used for the same configurations as those in the fifth embodiment, and description thereof will be omitted.

As shown in FIG. 13 , an organic EL device (light-emitting device) 150 according to this embodiment has a configuration in which a reflective portion 95 having light reflectivity is formed on the real display region 34 side of the substrate 12 .

By providing the reflective portion 95 on the substrate 12 in this way, the emitted light emitted from the opening portion 81 can be reliably emitted toward the observer. Therefore, the effect can be further promoted.

As shown in Embodiment 5 and Embodiment 6 above, since reliability is ensured by using practical electrodes, a bottom emission structure in which power wiring can be located in a pixel can be realized. In addition, with this configuration, the light propagating in the plane (horizontal direction of the substrate 12 ) out of the emitted light in the light-emitting layer 84 can also be emitted to the outside, so that a light extraction efficiency of 80% or more can be realized. In addition, the pixel aperture can be reduced, and contrast can be improved without using a polarizing plate by performing a light absorption process on areas other than the pixel aperture.

Furthermore, in the organic EL devices 100 , 110 , 120 , 130 , 140 , and 150 according to Embodiments 1 to 6 described above, optical members such as lenses may be provided as configurations for improving the extraction efficiency of emitted light.

In addition, in Embodiments 1 to 6, an organic EL device as a light-emitting device has been described, but the present invention is not limited to an organic EL device. In addition to organic EL devices, the present invention can also be used in devices using fluorescence such as plasma light emission or electron emission (for example, PDP, FED, SED).

(electronic equipment)

Next, an example of an electronic device including the organic EL device of the above embodiment will be described.

Fig. 14(a) is a perspective view showing an example of a mobile phone. In FIG. 14(a), reference numeral 1000 denotes a mobile phone main body, and reference numeral 1001 denotes a display portion using the above-mentioned organic EL device.

Fig. 14(b) is a perspective view showing an example of a wristwatch-type electronic device. In FIG. 14(b), reference numeral 1100 denotes a wristwatch body, and reference numeral 1101 denotes a display portion using the organic EL device.

Fig. 14(c) is a perspective view showing an example of a portable information processing device such as a word processor and a personal computer. In FIG. 14(c), reference numeral 1200 denotes an information processing device, reference numeral 1202 denotes an input unit such as a keyboard, reference numeral 1204 denotes a main body of an information processing device, and reference numeral 1206 denotes a display unit using the aforementioned organic EL device.

The electronic equipment shown in FIGS. 14( a ) to ( c ) has the organic EL device of the above-described embodiment, and therefore has a display portion capable of displaying images with high brightness and high contrast.

Furthermore, the electronic device is not limited to the above-mentioned mobile phone and the like, and can be applied to various electronic devices. For example, it can be used as a notebook computer, a liquid crystal projector, a personal computer (PC) and an engineering workstation (EWS) corresponding to multimedia, a pager, a word processor, a TV, a viewfinder type or a direct view type camera, an electronic It is used in the display part of electronic devices such as organizers, electronic desktop computers, navigation devices, POS terminals, and devices with touch panels.

In addition, since the electronic device of the present invention can reduce unevenness in luminance of the light-emitting element, it can be suitably applied to, for example, an electronic device having a large-area display with a diagonal of 20 inches or more.

Claims (20)

1. A light-emitting device comprising a light-emitting element formed by sequentially stacking a first electrode, a functional layer containing a light-emitting layer, and a second electrode on a substrate, wherein the first electrode and the second electrode have light reflectivity , the second electrode has an opening through which light from the light emitting layer passes. 2. The light-emitting device according to claim 1, wherein the first electrode has an inclination with respect to the substrate surface at a position overlapping with the opening of the second electrode on a plane. face. 3. The light-emitting device according to claim 1 or 2, wherein a partition wall surrounding the light-emitting element is provided, and the first electrode is extended to an inner wall surface of the partition wall. 4 . The light-emitting device according to claim 3 , further comprising an internal partition wall dividing a region surrounded by the partition wall planarly, and the first electrode is extended to an inner wall surface of the internal partition wall. 5. The light emitting device according to claim 3 or 4, characterized in that, the inner wall surface of the partition wall or the internal partition wall has an inclination angle of about 45° relative to the surface of the base body. 6. The light-emitting device according to any one of claims 1 to 5, wherein an anti-reflection mechanism is provided on the outer surface of the second electrode. 7. The light-emitting device according to any one of claims 1 to 6, wherein the second cathode is made of a transparent conductive film having light transmittance, and an auxiliary electrode that assists the conductivity of these transparent conductive films. According to the configuration, the opening through which the light from the light-emitting layer passes is formed in the auxiliary electrode. 8. A light-emitting device, having a pair of opposing electrodes on a substrate, and a functional layer containing a light-emitting layer sandwiched between these electrodes, characterized in that, between the substrate and the light-emitting layer is a The wires of the display area of the substrate are shielded, and a light-reflective reflective surface is formed on the side of the light-emitting layer on these wires, and the light emitted by the light-emitting layer passes through the side of the wires. of the opening. 9. The light-emitting device according to claim 8, wherein a plurality of branched wirings are formed for the light-emitting layer. 10. The light-emitting device according to claim 8, wherein the reflective surface has a light-scattering property for scattering emitted light. 11. The light-emitting device according to claim 8, wherein one of the electrodes sandwiching the light-emitting layer has light reflectivity. 12. The light-emitting device according to any one of claims 8 to 11, wherein the light-emitting layer has a concave-convex surface on a side opposite to the wiring. 13 . The light emitting device according to claim 12 , wherein at the end of the concave-convex surface, the angle formed between the vertical direction of the substrate and the concave-convex surface is not less than 30° and not more than 50°. 14. The light emitting device according to any one of claims 8 to 13, wherein the top or bottom of the concave-convex surface corresponds to the opening. 15. The light emitting device according to any one of claims 8 to 14, wherein a reflective portion having light reflectivity is formed on the substrate. 16. The light emitting device according to any one of claims 8 to 15, wherein a light absorbing layer is formed between the substrate and the wiring. 17. The light emitting device according to any one of claims 1 to 16, characterized in that the functional layer contains an organic electroluminescent material. 18. A method for manufacturing a light-emitting device, the light-emitting device is provided with a pair of opposing electrodes on a substrate and a functional layer including a light-emitting layer sandwiched between these electrodes, characterized in that, having the step of forming wiring that shields a display area of the substrate between the substrate and the light emitting layer, These wirings have a light-reflective reflective surface on the side of the light-emitting layer, and have openings on the sides through which light emitted from the light-emitting layer passes. 19. The method of manufacturing a light-emitting device according to claim 18, further comprising a step of forming a partition wall by separating a plurality of the light-emitting layers, and forming the partition wall adjacent to the partition wall by a droplet discharge method. The process of the light-emitting layer. 20. An electronic device comprising the light emitting device according to any one of claims 1 to 17.

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